ork The following table provides a probability distribution for the random variable . Excel File: data05-15.xlsx C f(x) 3 0.25 6 0.50 9 0.25 a. Compute E(@) , the expected value of C. b. Compute o 2, the variance of r (to 1 decimal). c. Compute o, the standard deviation of c (to 2 decimals)